BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional view of a heat-dissipating accessory plate for high speed drilling of the invention;
FIG. 2 is a sectional view illustrating the use of a heat-dissipating accessory plate for high speed drilling of the invention on the PCB during drilling; and
FIG. 3 is a sectional view of a drilling cover plate of prior art.